"We hope that the Iranians will use this deal in order to improve the economic situation in Iran and to improve the lot of the Iranian people, and not use it for adventures in the region," Jubeir said after talks with Kerry.

He warned that if Iran uses the nuclear deal “to cause mischief in the region we're committed to confront it resolutely."

The Saudi's coolness to the deal apparently prompted the White House later in the day to schedule a meeting between Jubeir and President Barack Obama on July 17.

Kerry vowed the United States will help its allies in the Sunni-dominated Arab states against any Iranian-supported unrest.

Shi'ite Iran is accused of supporting Huthi Shi’ite rebels in Yemen as they battle forces loyal to President Abd-Rabbu Mansur Hadi, who is exiled in Saudi Arabia.